You can try it on Windows 8.1 to see if the Windows can recognise 5 GPU. If so, there is nothing wrong with the hard ware.
Can you also swap the cards and have the same effect?
I dont think win 8.1 will have any effect.
Yes Buddy I swapped the cards in diff diff slots but same effect
I mine in windows 7
I have had resources issues in windows 7 with usb stick mining. But with many stick on 1 pc over 100.
Your issue could be in the bios of that mobo.
I am not familiar with it so I am not sure how it devides the pcie slots. You may have a bad setting on the six slots. They may need to be all legacy or all gen 1.
So if you do 1 card it can work on any of the six slots correct?
How much ram do you have? 1 stick of 8gb? Or more?
Try asking mobo questions on anantech.com asrock.com overclockers.com tomshardware.com
I have to think you are missing a setting for the pcie slots
-Yes 1 card is working on any of the six slots correctly.